Pass some GET parameters:

a
Asset ID of an Image asset (e.g. 111687). Multiple IDs can be passed, separated by commas, and the first nonempty one will be used.
s
Target image size (e.g. 100 for a sqaure resized-crop, or 'slider' or 'content-box').
sa
Pass both the s and a parameters at the same time, separated by a comma.
recache
Optional. Set to 'true' to force recaching.

This program is maintained by Dan Q <dan.q@bodleian.ox.ac.uk>